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SUMMARY:Towards quantum repeaters using frequency multiplexed entanglement
DTSTART;VALUE=DATE-TIME:20150616T154500Z
DTEND;VALUE=DATE-TIME:20150616T160000Z
DTSTAMP;VALUE=DATE-TIME:20200607T063613Z
UID:indico-contribution-841576@indico.cern.ch
DESCRIPTION:Speakers: Pascal Lefebvre (University of Calgary)\nQuantum com
munication is based on the possibility of transferring quantum states\, ge
nerally encoded into so-called qubits\, over long distances. Typically\, q
ubits are realized using polarization or temporal modes of photons\, which
are sent through optical fibers. However\, photons are subject to loss as
they travel through optical fibers or free space\, which sets a distance
barrier of around 100 kilometers. In classical communications\, this probl
em can be straightforwardly solved by amplification\, but this is not an o
ption in quantum mechanics because of the non-cloning theorem. Fortunately
\, photon loss can be overcome by implementing quantum repeaters [1]\, whi
ch create long-distance entanglement via entanglement swapping from shorte
r-distance entanglement links. Such protocols require the capacity to crea
te entanglement in a heralded fashion\, to store it in quantum memories\,
retrieve it after feed-forward information\, and to swap it.\n\nA variety
of architectures and protocols have been proposed for implementing quantum
repeaters [2]. Ideally\, a quantum repeater protocol should minimize the
physical resources required to establish entanglement between two points.
Our team is working on a specific quantum repeater scheme that explores f
requency multiplexing. This will allow us to increase the probability of
generating short-distance entanglement\, with a success rate close to 100%
\, while taking maximum benefit of the quantum memories developed by other
members of our group [3]. The proposed scheme requires quantum memories
and entangled photons pair sources capable to work in the frequency multip
lexing domain. This presentation will focus on the description of the gene
ral scheme and on the multiplexed entangled photon pair sources that we ar
e developing.\n\nhttps://indico.cern.ch/event/355942/contributions/841576/
LOCATION:University of Alberta CCIS L2-200
URL:https://indico.cern.ch/event/355942/contributions/841576/
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